US 11,796,238 B2
Heat source unit and refrigeration apparatus
Masaaki Takegami, Osaka (JP); Yoshikazu Uehara, Osaka (JP); and Akitoshi Ueno, Osaka (JP)
Assigned to Daikin Industries, Ltd., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Jan. 5, 2023, as Appl. No. 18/93,657.
Application 18/093,657 is a continuation of application No. PCT/JP2021/023189, filed on Jun. 18, 2021.
Claims priority of application No. 2020-144348 (JP), filed on Aug. 28, 2020.
Prior Publication US 2023/0152019 A1, May 18, 2023
Int. Cl. F25B 1/10 (2006.01); F25B 49/02 (2006.01); F25B 41/31 (2021.01); F25B 41/22 (2021.01); F25B 43/00 (2006.01)
CPC F25B 49/022 (2013.01) [F25B 1/10 (2013.01); F25B 41/22 (2021.01); F25B 41/31 (2021.01); F25B 43/006 (2013.01); F25B 2600/0253 (2013.01); F25B 2700/193 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A heat source unit comprising:
a heat source circuit connected to an air-conditioning unit and a refrigeration-facility unit to constitute a refrigerant circuit for performing a refrigeration cycle in which a high pressure is equal to or greater than a critical pressure; and
a control unit,
the heat source circuit including: a first compressor configured to suck a refrigerant from the air-conditioning unit; a second compressor configured to suck the refrigerant from the refrigeration-facility unit; an intermediate flow path into which the refrigerant compressed in the first and second compressors is discharged; a third compressor configured to suck the refrigerant from the intermediate flow path; a radiator; a liquid side flow path connected to a liquid end of the radiator; a gas-liquid separator provided in the liquid side flow path; a venting pipe through which gas in the gas-liquid separator is sent to the intermediate flow path; and a first valve configured to open and close the venting pipe, wherein
if a first condition that an intermediate pressure corresponding to a pressure of the intermediate flow path is greater than a predetermined value is satisfied in an operation in which the first, second, and third compressors are operated, the control unit executes a first action of increasing the number of revolutions of the third compressor.